A new route for the synthesis of highly-active N-doped TiO2 nanoparticles for visible light photocatalysis using urea as nitrogen precursor

Marques, Juliana Filipa Gouveia; Gomes, Tiago D.; Forte, Marta Adriana; Silva, Rui; Tavares, C. J.

doi:10.1016/j.cattod.2018.09.002

Cited by 79 publications

(32 citation statements)

References 34 publications

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“…150 mL of urea solution (104 mg/mL) was added under constant stirring rate till the solution turned into a white colloid without any precipitation. We used urea in preparation of TiO 2 NPs because addition of urea as the nitrogen source can positively affect surface area and activity of the produced nanoparticles as suggested in the literature ( Marques et al., 2019 ; Cheng et al., 2008 ). The obtained solution was then allowed to settle overnight and the precipitate was washed with DW for 5 times ( Chavan et al., 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Co-application of biochar and titanium dioxide nanoparticles to promote remediation of antimony from soil by Sorghum bicolor: metal uptake and plant response

Zand

Tabrizi

Heir

2020

Heliyon

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Association of titanium dioxide nanoparticles (TiO 2 NPs) and biochar (BC) to assist phytoremediation of Sb contaminated soil was investigated in this study. Seedlings of Sorghum bicolor were exposed to different regimes of TiO 2 NPs (0, 100, 250 and 500 mg kg −1 ) and BC (0, 2.5% and 5%), separately and in combination, to investigate the effects on plant growth, Sb absorption and accumulation and physiological response of the plant in Sb contaminated soil. Co-application of TiO 2 NPs and BC had positive effects on plant establishment and growth in contaminated soil. Greater accumulation of Sb in the shoots compared to the roots of S. bicolor was observed in all treatments. Application of BC increased immobilization of Sb in the soil. Using TiO 2 NPs significantly increased accumulation capacity of S. bicolor for Sb with the greatest accumulation capacity of 1624.1 μg per pot achieved in “250 mg kg −1 TiO 2 NPs+2.5% BC” treatment (P < 0.05). Association of TiO 2 NPs and BC significantly increased chlorophyll a (Chl a ) and chlorophyll b (Chl b ) contents of S. bicolor compared to the TiO 2 NPs-amended treatments. Results of this study presented a promising novel technique by combined application of TiO 2 NPs and BC in phytoremediation of Sb contaminated soils. Co-application of TiO 2 NPs and BC could reduce the required amounts of TiO 2 NPs for successful phytoremediation of heavy metal polluted soils. Intelligent uses of plants in accompany with biochar and nanomaterials have great application prospects in dealing with soil remediation.

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Section: Methodsmentioning

confidence: 99%

Co-application of biochar and titanium dioxide nanoparticles to promote remediation of antimony from soil by Sorghum bicolor: metal uptake and plant response

Zand

Tabrizi

Heir

2020

Heliyon

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“…Introduction of nitrogen into the TiO 2 structure contributes to a significant shift of the absorption spectrum into the visible region of the solar spectrum, a change in the refractive index, an increase in hardness, electrical conductivity, elastic modulus, and photocatalytic activity in regard to visible light [ 28 , 29 ]. Upon substitution of anions, a new level is formed above the valence band of TiO 2 [ 30 ]. As shown in Figure 3 , the presence of nitrogen leads to a change of the bandgap E g1 (TiO 2 ) > E g2 (N-doped TiO 2 ), thus contributing to the absorption of photons of light with lower energy.…”

Section: Factors Affecting the Efficiency Of Photocatalysis And Tementioning

confidence: 99%

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

et al. 2020

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The growth of industrialization, which is forced to use non-renewable energy sources, leads to an increase in environmental pollution. Therefore, it is necessary not only to reduce the use of fossil fuels to meet energy needs but also to replace it with cleaner fuels. Production of hydrogen by splitting water is considered one of the most promising ways to use solar energy. TiO2 is an amphoteric oxide that occurs naturally in several modifications. This review summarizes recent advances of doped TiO2-based photocatalysts used in hydrogen production and the degradation of organic pollutants in water. An intense scientific and practical interest in these processes is aroused by the fact that they aim to solve global problems of energy conservation and ecology.

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“…For example, compounding TiO 2 with a narrow bandgap semiconductor catalyst can enhance its absorption of visible light and construct a special heterostructure [18,19]. Doping elements can reduce the TiO 2 bandgap and increase its light absorption range [20,21]. Loading noble metals to TiO 2 as the co-catalyst can act as its active site to enhance photocatalytic activity [22,23].…”

Section: Introductionmentioning

confidence: 99%

Noble Metal-Free TiO2-Coated Carbon Nitride Layers for Enhanced Visible Light-Driven Photocatalysis

2020

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Composites of g-C3N4/TiO2 were one-step prepared using electron impact with dielectric barrier discharge (DBD) plasma as the electron source. Due to the low operation temperature, TiO2 by the plasma method shows higher specific surface area and smaller particle size than that prepared via conventional calcination. Most interestingly, electron impact produces more oxygen vacancy on TiO2, which facilitates the recombination and formation of heterostructure of g-C3N4/TiO2. The composites have higher light absorption capacity and lower charge recombination efficiency. g-C3N4/TiO2 by plasma can produce hydrogen at a rate of 219.9 μmol·g−1·h−1 and completely degrade Rhodamine B (20mg·L−1) in two hours. Its hydrogen production rates were 3 and 1.5 times higher than that by calcination and pure g-C3N4, respectively. Electron impact, ozone and oxygen radical also play key roles in plasma preparation. Plasma has unique advantages in metal oxides defect engineering and the preparation of heterostructured composites with prospective applications as photocatalysts for pollutant degradation and water splitting.

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A new route for the synthesis of highly-active N-doped TiO2 nanoparticles for visible light photocatalysis using urea as nitrogen precursor

Cited by 79 publications

References 34 publications

Co-application of biochar and titanium dioxide nanoparticles to promote remediation of antimony from soil by Sorghum bicolor: metal uptake and plant response

Co-application of biochar and titanium dioxide nanoparticles to promote remediation of antimony from soil by Sorghum bicolor: metal uptake and plant response

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Noble Metal-Free TiO2-Coated Carbon Nitride Layers for Enhanced Visible Light-Driven Photocatalysis

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